经理收入的ISM分析

以经理的收入与经理的经营业绩相一致为假设,确定和分析了影响企业经理收入的个人、企业和外部环境因素。依据这些因素间存在的逻辑关系,运用解析结构模型(ISM)方法进行了定量处理,建立了影响经理收入因素的多级递阶结构模型。通过模型,得出企业因素对经理收入起着决定性作用,为建立有效的经理激励机制提供了理论和实际依据。     

Change law of real vapor pressure of Al element in Ti-xAl （x = 25～50） melt during ISM process

A new model was established to calculate the real vapor pressure of the AI dement in the molten Ti-xAl (x=25～50, mole fraction, % ) alloy. The effects of the holding time, chamber pressure, mole fraction of AI and melting temperature on the real vapor pressure of AI element in the vacuum chamber were analyzed. Because of the impeding effect of the real vapor pressure on the evaporation loss rate, within a short time (less than 10s), the real vapor pressure tends to a constant value. When the chamber pressure is less than the saturated vapor pressure of the AI component, the real vapor pressure of Al is equal to the chamber pressure. While when the chamber pressure is larger than the saturated vapor pressure, the real vapor pressure is equal to the saturated vapor pressure of the Al element of the same condition.     

Ti—13Al—29Nb—2.5Mo合金ISM熔炼过程中多组元挥发损失

在基于活度系数计算模型的基础上，计算了ISM熔炼过程中不同熔炼温度下Ti-13Al-29Nb-2.5Mo(ω/%)熔体中Ti,Al,Nb元素的饱和蒸气压，计算结果表明，在熔炼温度范围内，Al元素的饱和蒸气压分别比Ti,Nb元素的饱和蒸气压大17倍和3070倍左右。在熔炼温度范围内对熔体中Al,Ti,Nb元素的挥发损失速率的计算表明，Al元素在损失速率比Ti,Nb的损失速率分别大43倍和144倍左右，在此基础上计算了Ti,Al,Nb元素的挥发损失量以及合金在熔炼后的化学成分，结果表明由于合金中各组元的挥发损失速率大小不一，使得熔炼前后合金的成分出现了变化。分析表明合理降低熔炼温度及增加真空室中压力可以减小成分的变化。本结果为ISM熔炼实践中合金成分控制提供有价值的理论指导。     

一种支持变型设计的产品结构分析方法

产品设计是一个反复的迭代过程。在变型设计过程中一处小的改动都有可能涉及大量的设计变动。本文针对当前变型过程设计研究的不足,提出了采用ISM(解析结构模型)进行产品结构分析的方法,通过此法不仅清楚地展示了各个产品零部件模块的结构关系,而且反映了产品各组成对象间联系的紧密程度和重要程度,从而为变型设计提供了理论依据。     

无线局域网的电磁兼容分析

文章简要介绍了无线局域网采用的扩频通信技术原理和工作频段——工科医频段的性质，结合电波传播理论，分析了无线局域网的电磁兼容性，提出了在规划和使用过程中应该注意的一些问题。     

Utility Priority Number Evaluation for FMEA

Traditionally, decisions on how to improve an operation are based on risk priority number (RPN) in the failure mode and effects analysis (FMEA). Many scholars questioned the RPN method and proposed some new methods to improve the decision process, but these methods are only measuring from the risks viewpoint while ignoring the importance of corrective actions. The corrective actions may be interdependent; hence, if the implementation of corrective actions is in proper order, selection may maximize the improvement effect, bring favorable results in the shortest times, and provide the lowest cost. This study aims to evaluate the structure of hierarchy and interdependence of corrective action by interpretive structural model (ISM), then to calculate the weight of a corrective action through the analytic network process (ANP), then to combine the utility of corrective actions and make a decision on improvement priority order of FMEA by utility priority number (UPN). Finally, it verifies the feasibility and effectiveness of this method by application to a case study. An erratum to this article can be found at     

Ti-5Al-2.5Sn合金ISM熔炼工艺参数优化设计

运用直接差分方法,建立了感应凝壳熔炼温度场计算模型,并在此基础上模拟计算了熔炼Ｔｉ－５Ａｌ－２．５Ｓｎ合金时坩埚内温度变化。提出了合理的功率进给方式。研究了炉料和熔炼功率对熔体最终温度和出液量的影响,优化了熔炼工艺参数,为实际熔炼提供了理论指导。     

An integrated ISM fuzzy MICMAC approach for modelling the supply chain knowledge flow enablers

The aim of this study is to identify supply chain knowledge flow enablers (SCKFEs) to inspect interrelationships among these enablers and classify these enablers into driving power and dependence power using an integrated interpretive structural modelling (ISM) and fuzzy Matriced Impacts Croisés Multiplication Appliquée á un Classement (MICMAC) methodology. While the ISM methodology analyses the interactions among the SCKFEs, fuzzy MICMAC analysis is employed to obtain insights into the dependencies among the SCKFEs. A total of 34 SCKFEs were identified through the literature review and expert opinion. As an example, an Indian manufacturing organisation is selected that is willing to adopt the successful knowledge flow for improving supply chain (SC) performance to overcome the intense competition among the SC versus SC. The research shows SCKFEs having high driving power and low dependence have strategic importance because of their driving nature, while the SCKFEs having high dependence and low driving power are more performance orientated. Therefore, it is the responsibility of SC executives to address the high driving power SCKFEs for the enhancement of SC performance. This categorisation provides a useful tool to top management to differentiate between independent and dependent SCKFEs and their mutual relationships, helping them focus on those key SCKFEs that are most significant. This gives a clear picture to SC practitioners and decision-makers about number of SCKFEs, interrelationship and dependencies existing among them.     

改进的非相干信号子空间宽带测向算法

研究了非相干信号子空间高分辨率宽带测向算法(ISM),提出了基于最大功率进行频点选择的改进的ISM算法,即将接收的时域信号经傅里叶变换后,选取代表最高功率的子带的频点来构造频谱密度矩阵,然后将该矩阵应用于窄带测向算法进行测向,提高了测向精度,减小了运算量。计算机仿真表明,新算法比原算法在分辨概率达到100%时的信噪比降低了9.5 dB,并且方差也明显比原算法小。     

基于辅助阵元的非圆信号自校正算法及其性能分析简

针对非圆信号空间谱测向中方位依赖幅相误差的校正问题,基于辅助阵元自校正算法(ISM, instrumental sensor method)基本原理,提出一种改进的ISM算法：NC-ISM算法。该算法通过利用最大非圆率信号的扩展数据模型,提高了信号利用率,使其估计精度较一般的ISM算法有明显提升,最大可分辨信源数也增加一倍。对该算法的理论性能进行研究,证明了其参数估计的统计一致性,并采用一阶误差分析方法推导了辅助阵元模型误差影响下参数估计的均方误差表达式,从而为工程应用提供理论支撑。仿真结果验证了理论推导的正确性,同时表明,该算法较ISM算法在辅助阵元模型误差与低信噪比下都有更强的顽健性。